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Thread: 912 hydraulic lock

  1. #11
    Senior Member Slyfox's Avatar
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    Dec 2008
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    felts field, spokane
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    1,327

    Default Re: 912 hydraulic lock

    thanks guys.

  2. #12
    Senior Member 109JB's Avatar
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    Mar 2019
    Location
    Morris, IL
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    484

    Default Re: 912 hydraulic lock

    Old thread, but working on engine installation for my rebuild project. The engine, with mount, oil tank and all was mounted on a stand for the last 10 months or so. I got it on the airplane, and went to turn the crank and it would not budge. Pulled the top plugs and the #4 was full of oil. I mean the top plug came out soaked in oil. Pulled all the bottom plugs and #3 also had some oil in it but not as much. Finding this thread, I understand it now, but is the quantity of oil I found concerning or should I just chalk it up to sitting for 10 months, do a prop pull-through on every preflight and just forget about it? Or, is there possibly a check valve or something like that I need to replace?

    Thanks
    John Brannen
    Morris, IL
    Sonerai IIL (Single Seat)
    Kitfox 3/4 1050 - Rotax 582 (Back Flying and sold)
    Kitfox IV 1050 - Rotax 582 (sold)
    Kitfox IV 1200 Speedster - Rotax 912 UL (project)
    Piper Twin Comanche (Sold)
    Glasair 1 FT (Waiting to start)

  3. #13
    Super Moderator Av8r3400's Avatar
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    Jan 2009
    Location
    Merrill, WI
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    3,044

    Default Re: 912 hydraulic lock

    Always pull it through before starting.
    Always use a Rotax oil filter. They have a check valve that *helps* prevent this from happening.
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
    912UL 105hp Zipper
    YouTube Videos

  4. #14
    Super Moderator desertdave's Avatar
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    Jun 2019
    Location
    Scottsdale AZ
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    304

    Default Re: 912 hydraulic lock

    ^^^^^^^^^
    This!
    Dave
    KitFox 6 Taildragger
    912 ULS
    Whirlwind 70” Prop
    Garmin G3x
    All around nice guy

  5. #15

    Join Date
    Mar 2010
    Location
    TX
    Posts
    112

    Default Re: 912 hydraulic lock

    I have had this happen twice in seven years. Both times when the engine sat for a few months. I ALWAYS pull the engine through before starting. Always the left rear cylinder. Model IV with 912 ULS.

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